Clarity discussion forum

Dear Ivan,
Thanks for your input, we need to control a 6 stream selection valve
(valco micro electric) maybe via BCD code setup on TTL outputs, or from
the Dani GC1000 time function ouputs,the GC outputs will also be used to
switch the Gas sampling valve (valco micro electric) the sequence may
vary. 2 inj from stream Cal-1, 2 inj from stream Cal-2 followed by 10
injections from stream-3. I would like to know more about reusing the
same sequence mode with command line parameters.
Thanks,
Menno


Anatech Instruments (Pty) Ltd
P O Box 98485, Sloane Park, 2152
Gauteng, South Africa
Tel : + 27 11 462 6776
Fax : + 27 11 704 6490

Dear Jan,
Please advise what is the max number of samples in a sequence?
We need to configure an automated in-line GC for continuous sampling via
gas sampling valve.
Regards,
Menno


Anatech Instruments (Pty) Ltd
P O Box 98485, Sloane Park, 2152
Gauteng, South Africa
Tel : + 27 11 462 6776
Fax : + 27 11 704 6490

Dear Menno,

the number of samples in sequence is not limited, however, the control of extremely long sequence table before run may take some time. You can may be use for automated sampling the single analysis mode. You may also run several analyses from the same line.

For automated analyzer, we have adopted some special setup with reusing the same sequence repeatedly using command line parameters. Please describe in detail your analysis procedure, I can suggest some solution for you.

Best regards

Ivan Vins

DataApex, Ltd
Podohradska 1
15500 Praha 5
Czech Republic

Phone +420 251612067
Fax +420 251613507

www.dataapex.com

Dear Menno,

here is a suggestion for configuration of automated gas sampler device controlled by Clarity (an automated system recovery after power failure was required too) :

1) The Clarity sequence can be started using a bat file containing a following command line

start c:\clarity\clarity.exe i=1 u=test q=c:\clarity\analyzer\test.seq run_seq=1

(see reference guide for command line parameters description, default installation with user Test and project Analyzer is supposed)

2) this sequence should contain separate line for each standard and N (10) lines for the unknowns. The file names should include vial %v and date/time %D_%T variables to ensure the uniqueness of them.

3) the bat file from point 1) should be called from the Windows start menu and from the last sequence line Run program column. (Make the columns Run Program, Program to Run and Parameters visible using the Setup columns in Sequence). This will ensure the sequence will be started at each computer start and after the previous sequence run was finished.

4) if the gas sampling valve is to be used together with the sample/standard selecting valve, it will be best to connect the Clarity Ready out signal in series with the GC Ready signal to the Clarity Start signal. This will ensure the run will be started only when the GC is ready. The actual sampling should be part of the run, i.e. the switching of the sampling and selecting valve should be programmed from the method event table, if they will be controlled by Clarity digital outputs (or in the GC control events, if controlled from GC). Alternatively the Sendcom.exe utility can be used for RS232 controlled valves. Separate methods should be used in the sequence, one for each standard type, one for the unknowns, differing only in the actuation of the selecting valve.

5) The same calibration should be used for the calib and unknown methods, either using replace or floating average. To get the results calculated by the relevant calibration file, the chromatograms should be opened with the stored calibration option.

6) the optional SST module can be used to monitor the system performance and eventually to trigger some actions.

7) The computer as well as the GC will have to be configured to recover from the power interruption (best way some intelligent UPS allowing for shutdown and recovery should be used, during abrupt power failure may be quite often some opened files (Clarity cfg, dsk, log) damaged.


Best regards

Ivan Vins

DataApex